title: Bond strength of mineral trioxide aggregate to root dentin after exposure to different irrigation solutions.
abstract: OBJECTIVE
  The aim of the study was to evaluate the regional push-out bond strength of mineral trioxide aggregate (MTA) after exposure to sodium hypochlorite (NaOCl), ethylenediaminetetraacetic (EDTA), and peracetic acid (PAA) irrigation solutions.
  
  
  METHODS
  1-mm-thick longitudinal slabs of root dentin were obtained from freshly extracted human canine teeth (n = 80). Simulated root perforation defects, 1 mm in diameter, were prepared in the coronal, middle, and apical thirds of radicular dentin. Mineral trioxide aggregate was placed into the cavities, and the specimens were stored for 1 week at 37°C. Thereafter, the specimens were randomly divided into four groups (n = 20) according to the irrigation solution applied over the repair sites: Group 1-10 ml of 5.25% NaOCl for 10 min; Group 2-10 ml of 5.25% NaOCl for 10 min, followed by 5 ml 17% EDTA for 5 min; Group 3-10 ml of 5.25% NaOCl for 10 min, followed by application of 5 ml 1% PAA for 5 min; and Group 4-no irrigation. Push-out test was performed at a crosshead speed of 1 mm/min. Debonding values were compared statistically using two-way analysis of variance and Tukey tests (P < 0.05).
  
  
  RESULTS
  The push-out bond strength of MTA was not affected by the type of irrigation solution or location of the perforation defects (both P < 0.05). Stereomicroscopic inspection of the samples showed that the bond failure was predominantly adhesive.
  
  
  CONCLUSIONS
  Exposure of repaired root perforations to 5.25% NaOCl, 17% EDTA, or 1% PAA does not alter the dislocation resistance of MTA at different locations of root dentin.
authors.affiliation: Department of Endodontics, Faculty of Dentistry, Hacettepe University, Ankara, Turkey.
authors.forename: Emre
authors.initials: E
authors.lastname: Nagas
authors.forename: Zafer C
authors.initials: ZC
authors.lastname: Cehreli
authors.forename: Mehmet Ozgur
authors.initials: MO
authors.lastname: Uyanik
authors.forename: Veli
authors.initials: V
authors.lastname: Durmaz
authors.forename: Pekka K
authors.initials: PK
authors.lastname: Vallittu
authors.forename: Lippo V J
authors.initials: LV
authors.lastname: Lassila
mesh_terms: D017607:Aluminum Compounds / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry*; D003804:Dentin / Q000737:chemistry*; D004338:Drug Combinations; D006801:Humans; D010087:Oxides / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D012996:Solutions; D007507:Therapeutic Irrigation; D014092:Tooth Root / Q000737:chemistry*
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D004338:Drug Combinations; D010087:Oxides; D017640:Silicates; D012996:Solutions; C086631:mineral trioxide aggregate
keywords: bond strength; ethylenediaminetetraacetic acid; mineral trioxide aggregate; peracetic acid